[Enterprise Search] Add parseQueryParams helper (#83750) (#83842)

* [Enterprise Search] Add parseQueryParams helper

This PR migrates part of the ent-search queryParams util, `parseQueryParams` for use in Workplace Search.

`setQueryParams` was no a part of this PR because it is only used one time in App Search and a better alternative might be available for that use-case

* Remove mock

* Actually test functionality of query-string

* Add test for array

* Better test name

Author: scottybollinger

x-pack/plugins/enterprise_search/public/applications/shared/query_params/index.ts

@@ -0,0 +1,7 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+export { parseQueryParams } from './query_params';

x-pack/plugins/enterprise_search/public/applications/shared/query_params/query_params.test.ts

@@ -0,0 +1,14 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { parseQueryParams } from './';
+
+describe('parseQueryParams', () => {
+  it('parse query strings', () => {
+    expect(parseQueryParams('?foo=bar')).toEqual({ foo: 'bar' });
+    expect(parseQueryParams('?foo[]=bar&foo[]=baz')).toEqual({ foo: ['bar', 'baz'] });
+  });
+});

x-pack/plugins/enterprise_search/public/applications/shared/query_params/query_params.ts

@@ -0,0 +1,10 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import queryString from 'query-string';
+
+export const parseQueryParams = (search: string) =>
+  queryString.parse(search, { arrayFormat: 'bracket' });